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Another update: I have tried with a 1.10 version of conquest https://minecraft.curseforge.com/projects/conquest-reforged but, it crashes with the exact same error by following the exact same steps. I would really like to use conquest in my video, so some help about this error would be nice.
As far as I know, it's the fonts. If you remove the fonts from the conquest pack it should work.
I don't know enough about resource packs to tell you how to do that but you should be able to find out. The last person with this issue used a resource pack which had its HD fonts in a separate pack, so they could just be removed. You could also try any of the jars linked in the thread (though I'm unsure if there's any knowledge to be gained as none of them solved it for the previous person): https://www.replaymod.com/forum/thread/1593